[PATCH 01/13] KVM: PPC: Book3S PR: Implement LPCR ONE_REG

[Alexander Graf <agraf@suse.de>]

To control whether we should inject interrupts in little or big endian
mode, user space sets the LPCR.ILE bit accordingly via ONE_REG.

Let's implement it, so we are able to trigger interrupts in LE mode.

Signed-off-by: Alexander Graf <agraf@suse.de>
---
 arch/powerpc/include/asm/kvm_book3s.h | 1 +
 arch/powerpc/kvm/book3s_64_mmu.c      | 8 +++++++-
 arch/powerpc/kvm/book3s_pr.c          | 6 ++++++
 3 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/kvm_book3s.h b/arch/powerpc/include/asm/kvm_book3s.h
index bb1e38a..27b1041 100644
--- a/arch/powerpc/include/asm/kvm_book3s.h
+++ b/arch/powerpc/include/asm/kvm_book3s.h
@@ -106,6 +106,7 @@ struct kvmppc_vcpu_book3s {
 #endif
 	int hpte_cache_count;
 	spinlock_t mmu_lock;
+	ulong lpcr;
 };
 
 #define CONTEXT_HOST		0
diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index 83da1f8..4a77725 100644
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -38,7 +38,13 @@
 
 static void kvmppc_mmu_book3s_64_reset_msr(struct kvm_vcpu *vcpu)
 {
-	kvmppc_set_msr(vcpu, MSR_SF);
+	struct kvmppc_vcpu_book3s *vcpu_book3s = to_book3s(vcpu);
+	ulong new_msr = MSR_SF;
+
+	if (vcpu_book3s->lpcr & LPCR_ILE)
+		new_msr |= MSR_LE;
+
+	kvmppc_set_msr(vcpu, new_msr);
 }
 
 static struct kvmppc_slb *kvmppc_mmu_book3s_64_find_slbe(
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index c5c052a..9189ac5 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -1110,6 +1110,9 @@ static int kvmppc_get_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
 	case KVM_REG_PPC_HIOR:
 		*val = get_reg_val(id, to_book3s(vcpu)->hior);
 		break;
+	case KVM_REG_PPC_LPCR:
+		*val = get_reg_val(id, to_book3s(vcpu)->lpcr);
+		break;
 	default:
 		r = -EINVAL;
 		break;
@@ -1128,6 +1131,9 @@ static int kvmppc_set_one_reg_pr(struct kvm_vcpu *vcpu, u64 id,
 		to_book3s(vcpu)->hior = set_reg_val(id, *val);
 		to_book3s(vcpu)->hior_explicit = true;
 		break;
+	case KVM_REG_PPC_LPCR:
+		to_book3s(vcpu)->lpcr = set_reg_val(id, *val) & LPCR_ILE;
+		break;
 	default:
 		r = -EINVAL;
 		break;
-- 
1.8.1.4